1) Incredulity 
Pyrrhonism, or Pyrrhonian skepticism, was a school of skepticism founded by Aenesidemus in the 1st century BC and recorded by Sextus Empiricus in the late 2nd century or early 3rd century AD. It was named after Pyrrho, a philosopher who lived from c. 360 to c. 270 BC, although the relationship between the philosophy of the school and that of the h...
total or radical skepticism
• (n.) Skepticism; universal doubt.
(from the article `Skepticism`) The other major form of ancient Skepticism was Pyrrhonism, apparently developed by medical Skeptics in Alexandria. Beginning with Aenesidemus (1st ... ...indifference to circumstances. He concluded that man must suspend judgment (practice epoch) on the reliability of sense perceptions and simply ... Ca...
a sub-philosophy of skepticism that holds that any assent with regard to non-evident propositions will always remain in a state of perpetual inquiry; therefore, proof or disproof of an observation is not necessarily a valid reason for holding an opinion on the matter.
the Skeptic doctrines of Pyrrho and his followers. · extreme or absolute skepticism.